Intel Xeon E3-1281 v3 

Released May, 2014
  • 3.7 GHz
  • Quad core
5.2 Out of 10

The previous Ivy Bridge-EX flagship had 4.31 Billion transistors configured on a 541mm2 so its easy to tell that the Haswell-EP takes die size and transistor count to a new level.
by hassan-mujtaba (Sep, 2014)
The LCC variants range from 4-8 cores, configured on a 354mm2 die consisting of 2.6 Billion transistors.
by hassan-mujtaba (Sep, 2014)

CPUBoss Review Our evaluation of the Intel Xeon E3-1281 v3 among all CPUs


Benchmark performance using all cores

Xeon E3-1281 v3
PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

Xeon E3-1281 v3
PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Xeon E3-1281 v3
Sky Diver and Cloud Gate

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

Xeon E3-1281 v3
CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Xeon E3-1281 v3
Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more


Are you paying a premium for performance?

Xeon E3-1281 v3
Sky Diver, Cloud Gate, CompuBench 1.5 Bitcoin mining and 11 more


CPUBoss Score

Combination of all six facets

Xeon E3-1281 v3

Benchmarks Real world tests of the Intel Xeon E3-1281 v3

GeekBench (32-bit) Data courtesy Primate Labs

Xeon E3-1281 v3
Core i7 4790K
Core i7 4790


Xeon E3-1281 v3
Core i7 4790K
Core i7 4790

PassMark (Single Core)

Xeon E3-1281 v3
Core i7 4790

In The News From around the web


Intel Announces Xeon E7 v3 Processors Based on Haswell-EX

by Scott Michaud |
The E7-8880L v3 is a low power version, relatively speaking, which will also contains eighteen cores that are clocked at 2.0 GHz.
The largest model is the E7-8890 v3, which contains eighteen cores fed by a total of 45MB in L3 cache.

Intel Haswell-EP Xeon 14 Core Review: E5-2695 V3 and E5-2697 V3

by Ian Cutress |
The prevalence of multithreaded code is server and workstation environments make the frequency difference extremely important, especially when it comes to the types of workloads that have frequent memory delays and accesses.
If it happens in a core as part of the logic or caches, that core can be fused off and the die can sold as a lower core part.

Eighteen-core Xeon E7 v3 Based on Haswell-EX in Q2'15

by Scott Michaud |
If that is not enough cores, then you can pick up an eight-socket motherboard and load it up with multiple of these.
While Ivy Bridge-EX was available with up to 15 physical cores per processor, double that with HyperThreading, Haswell-EX is increasing that to 18, or 36 simultaneous threads with HyperThreading.
It might also come to pass that some server motherboard manufacturers will end up supporting the DDR4-2133 at 3DPC, similar to some efforts made with Patsburg.
Low quality conversion loves faster individual cores, hence the W processor wins out due to its higher full-load frequency.

Specifications Full list of technical specs


Clock speed 3.7 GHz
Turbo clock speed 3.9 GHz
Cores Quad core
Socket type LGA 1150
Is unlocked No


Has a NX bit Yes
Supports trusted computing Yes
Has virtualization support Yes
Instruction set extensions
  1. MMX
  2. EM64T
  3. SSE4.2
  4. Supplemental SSE3
  5. AVX 2.0
  6. SSE4.1
  7. AVX
  8. SSE
  9. SSE4
  10. F16C
  11. FMA3
  12. AES
  13. SSE3
  14. SSE2
Supports dynamic frequency scaling Yes

memory controller

Memory controller Built-in
Memory type DDR3-1600
Channels Dual Channel
Supports ECC Yes
Maximum bandwidth 25,600 MB/s


Architecture x86-64
Threads 8 threads
L2 cache 1 MB
L2 cache per core 0.25 MB/core
L3 cache 8 MB
L3 cache per core 2 MB/core
Manufacture process 22 nm
Max CPUs 1

integrated graphics

GPU None

power consumption

Annual home energy cost 19.75 $/year
Annual commercial energy cost 71.83 $/year
Performance per watt 3.81 pt/W
Typical power consumption 66.63W


Architecture DMI
Transfer rate 5,000 MT/s
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